Employee Benefits Postretirement Health and Life Insurance Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Discount rate	9.42%	10.10%
Health care cost trend rate assumed for next year	6.90%	8.31%
Ultimate trend rate	6.90%	8.31%
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	$ 4,705	$ 4,531	$ 4,062
Pension, postretirement and other long-term liabilities	121,128	118,983
U.S. and Non-U.S. Post-retirement [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	937
Defined Benefit Plan, Prior Service Credits, Amounts that will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	1,642
Defined Benefit Plan, Actuarial Net (Gains) Losses, Amounts that will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	468
U.S. Plans, Other Benfits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning	9,484	9,695
Service cost	68	75	60
Interest cost	481	511	580
Effects of currency translation	0	0
Actuarial losses (gains)	872	(177)
Benefits paid	(643)	(620)
Benefit obligation, ending	10,262	9,484	9,695
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning	0	0
Employer contributions	643	620
Benefits paid	(643)	(620)
Fair value of plan assets, ending	0	0	0
Net amount recognized	(10,262)	(9,484)
Accrued current benefit liability recorded in Accrued Expenses and Other Current Liabilities	(797)	(802)
Pension, postretirement and other long-term liabilities	(9,465)	(8,682)
Curtailment	0	0	0
Amortization of prior service (credit) cost	(1,622)	(1,622)	(1,622)
Amortization of actuarial (gains) losses	407	434	314
Net periodic pension cost	(666)	(602)	(668)
Other Postretirement Benefit Expense	50
Non-U.S. Plans, Other Benfits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning	1,895	1,647
Service cost	4	6	5
Interest cost	173	162	187
Effects of currency translation	(182)	140
Actuarial losses (gains)	342	94
Benefits paid	(108)	(154)
Benefit obligation, ending	2,124	1,895	1,647
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning	0	0
Employer contributions	108	154
Benefits paid	(108)	(154)
Fair value of plan assets, ending	0	0	0
Net amount recognized	(2,124)	(1,895)
Accrued current benefit liability recorded in Accrued Expenses and Other Current Liabilities	(140)	(132)
Pension, postretirement and other long-term liabilities	(1,984)	(1,763)
Curtailment	0	0	(1,020)
Amortization of prior service (credit) cost	(21)	(21)	(36)
Amortization of actuarial (gains) losses	(1)	(1)	(11)
Net periodic pension cost	$ 155	$ 146	$ (875)